Advisories for Npm/@Fastly/Js-Compute package

The implementation of the following functions were determined to include a use-after-free bug: FetchEvent.client.tlsCipherOpensslName FetchEvent.client.tlsProtocol FetchEvent.client.tlsClientCertificate FetchEvent.client.tlsJA3MD5 FetchEvent.client.tlsClientHello CacheEntry.prototype.userMetadata of the fastly:cache subsystem Device.lookup of the fastly:device subsystem This bug could allow for an unintended data leak if the result of the preceding functions were sent anywhere else, and often results in a Compute service crash causing an HTTP 500 error to be returned. As all requests to Compute are …

The JS Compute Runtime for Fastly's Compute@Edge platform provides the environment JavaScript is executed in when using the Compute@Edge JavaScript SDK. In versions prior to 0.5.3, the Math.random and crypto.getRandomValues methods fail to use sufficiently random values. The initial value to seed the PRNG (pseudorandom number generator) is baked-in to the final WebAssembly module, making the sequence of random values for that specific WebAssembly module predictable. An attacker can use …